EP3008799A2 - Anneau de court-circuit pour machine électrique asynchrone composé de segments en portions d'arc de cercle - Google Patents

Anneau de court-circuit pour machine électrique asynchrone composé de segments en portions d'arc de cercle

Info

Publication number
EP3008799A2
EP3008799A2 EP14723806.7A EP14723806A EP3008799A2 EP 3008799 A2 EP3008799 A2 EP 3008799A2 EP 14723806 A EP14723806 A EP 14723806A EP 3008799 A2 EP3008799 A2 EP 3008799A2
Authority
EP
European Patent Office
Prior art keywords
short
segments
ring
circuit
shaped segments
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP14723806.7A
Other languages
German (de)
English (en)
Other versions
EP3008799B1 (fr
Inventor
Harald Laue
Arndt Kelleter
Thomas Berger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP3008799A2 publication Critical patent/EP3008799A2/fr
Application granted granted Critical
Publication of EP3008799B1 publication Critical patent/EP3008799B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/16—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors
    • H02K17/20—Asynchronous induction motors having rotors with internally short-circuited windings, e.g. cage rotors having deep-bar rotors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2213/00—Specific aspects, not otherwise provided for and not covered by codes H02K2201/00 - H02K2211/00
    • H02K2213/12—Machines characterised by the modularity of some components

Definitions

  • Short-circuit ring for an electric asynchronous machine composed of partial arc-shaped segments
  • the present invention relates to asynchronous electrical machines, and more particularly to a short circuit ring for an asynchronous electrical machine.
  • a short-circuit cage of an asynchronous machine generally consists of a plurality of in the axial direction of the asynchronous machine
  • Rods and shorting rings preferably consist of a highly electrically conductive material, in particular a metal such as copper or aluminum or alloys thereof.
  • Short circuit cages of rotors of an asynchronous motor vehicle are nowadays often produced by casting.
  • Short-circuit rings and rods can be inserted directly around a tool
  • Lamella package of the rotor are sprayed, so that a homogeneous composite of, for example, pure copper can arise with very good electrical conductivity properties.
  • Short circuit rings are assembled.
  • the rods can be inserted into suitably formed grooves of the rotor-forming plate packs and then connected at their ends by means of short-circuit rings.
  • the short-circuit rings here also have suitably formed recesses, for example in the form of grooves into which the rods can be inserted. Rods mounted in this way can then be connected to the short-circuit ring after joining, for example by means of solder, mechanical deformation or laser welding.
  • the short-circuiting rings have hitherto generally been produced in one piece or from one Plural composed of annular plates.
  • the short-circuit rings can either be cast and subsequently machined or mechanically produced from semi-finished products. Laser cutting and waterjet cutting techniques have also been used.
  • shorting ring A casting of short circuit rings of such large diameter with many grooves, in particular of very good electrically conductive copper, is currently not possible or requires at least considerable
  • the short-circuit ring can be produced easily and inexpensively.
  • the short-circuit ring can allow both very low electrical resistance losses as well as the
  • a short-circuit ring for an asynchronous electrical machine which is circular and has along its circumference a plurality of axially extending recesses into which rods of a rotor cage of the asynchronous machine can be inserted.
  • the short-circuit ring is characterized in that it is composed of several partial arc-shaped segments.
  • each of the segments is intended to be partial arc-shaped, that is, part of a
  • Each of the segments can, for example, a recess or a few recesses, for example, up to ten recesses, in the form of grooves, in the bars of a rotor cage of the
  • the short-circuit ring composed of the several segments can then have the sum of the recesses of the segments, for example 100 or more recesses.
  • the partial arc-shaped segments can be extruded.
  • extrusion is understood here a forming process, which counts to the pressure forming process, and with the help of which in particular also irregularly shaped prismatic profiles can be produced.
  • Pressling previously possibly on a
  • Forming temperature was brought, pressed by a punch through a die, so that the outer shape of the pressing strand is determined by the die. For example, by differently shaped mandrels cavities can be generated. In this way prismatic profiles up to several meters in length can be produced. Subsequently, the profile can be sawed off the strand to the length of the later short-circuit ring. Extruded partial arc-shaped segments can be produced inexpensively. Among other things, electrically highly conductive metals such as copper or copper alloys can be extruded.
  • the segments when they have been extruded at low temperatures, that is, as part of a cold forming process, and high pressures, they can have very high mechanical strength, which is generally superior to the strength of short circuit rings formed at high temperatures, such as molded shorting rings is.
  • the partial arc-shaped segments can also be formed as thin sheets. These thin sheets can be punched, for example, in the desired part arc shape. Several partial arc-shaped punched sheets can then be put together in the circumferential direction and assembled into a short-circuit ring. To the
  • Short circuit ring in the axial direction to provide the desired length several of the thin sheets can be stacked one behind the other.
  • the sheets arranged in different planes in the axial direction can preferably be offset relative to one another in the circumferential direction.
  • Sheet segments which together form a ring, and on the other hand composed of several layers of such rings.
  • the partial arc-shaped sheet metal segments of the individual layers are arranged offset from each other in the circumferential direction, a high mechanical stability of the entire short-circuit ring can be achieved.
  • all of the short-circuit ring-forming partial arc-shaped segments have an identical geometry.
  • the entire short-circuit ring of several identically shaped extruded segments or be composed of a plurality of identically formed sheet metal segments.
  • this can also be the storage and transport of the segments and their processing can be simplified because the segments can be stored and transported, for example, as bulk material.
  • the fact that the short-circuit ring is not provided as a whole one-piece ring, but is composed of a plurality of arcuate segment-shaped segments, also necessary for the storage and transport of the components for the short-circuit ring space can be reduced.
  • Adjacent partial arc-shaped segments can be connected to each other by means of a tongue and groove connection.
  • a protruding region designated as a spring is formed on a segment on a surface directed toward an adjacent segment, and a recess designated as a groove is formed on the corresponding counter surface of the adjacent segment.
  • the projecting portion and the recess are preferably formed complementary to one another, so that they can preferably interlock positively and positively. This can be achieved that adjacent segments already at the initial
  • the projecting region and the recess can have any suitable geometries such as, for example, round, angular, dovetailed or similar shapes.
  • Adjacent partial arc-shaped segments may preferably
  • Connection increases both the mechanical strength of the shorting ring and an electrical conductivity along the circumference of the shorting ring.
  • Welding of adjacent segments can thereby by means of various suitable techniques such as arc welding, friction welding,
  • adjacent segments may also be soldered together, individually by local soldering at the interfaces between adjacent segments or in the entirety of the segments
  • the partial arc-shaped segments can in principle consist of any electrically conductive material, in particular metal.
  • the formation of the short-circuit ring of several segments appears particularly advantageous for the case that the segments made of copper or a copper alloy. Copper and its alloys have a very high electrical conductivity and are therefore particularly well suited to the
  • Short circuit ring an asynchronous machine occurring high electrical currents to conduct as low loss.
  • copper is difficult to process into large components, such as a one-piece large diameter shorting ring.
  • casting a large copper component has been found to be problematic.
  • the short-circuit ring described above can be used in particular in an electrical asynchronous machine, the proposed
  • Segmentation of the short-circuit ring as particularly advantageous Asynchronous machines with a large rotor diameter appears, as they are to be used for generating high torques, for example in motor vehicles or commercial vehicles.
  • Possible features and advantages of embodiments of the invention are herein in part with respect to a shorting ring according to the invention, partly with respect to the manufacture of such a shorting ring and partly with respect to an electrical asynchronous machine with such
  • Fig. 1 shows a perspective view of a rotor of an electrical
  • Fig. 2 shows a perspective view of a partial arc-shaped
  • Segment for a short-circuiting ring according to an embodiment of the present invention.
  • FIG. 3 shows a perspective view of a rotor for an asynchronous electrical machine with an alternative embodiment of a short-circuiting ring according to an alternative embodiment of the present invention.
  • FIG. 4 shows a perspective top view of the rotor from FIG. 3.
  • the figures are only schematic and not to scale.
  • Like reference numerals in the figures designate the same or equivalent
  • FIG. 1 shows a rotor 3 for an asynchronous electric machine according to an embodiment of the present invention.
  • the rotor 3 has an im
  • Substantially cylindrical rotor body 5 on the outside of a
  • the rotor body 5 itself may consist of a soft magnetic material.
  • a short circuit cage is arranged, which consists of elongated rods 7 and two short-circuiting rings 1. The elongated rods are inserted into the grooves 9 of the rotor body 5 and protrude axially beyond this.
  • the two axial ends of the rotor body 5 the two axial ends of the rotor body 5.
  • Short circuit rings 1 arranged.
  • the short-circuit rings 1 also have recesses 13 in the form of grooves in which the over the rotor body 5 superior ends of the rods 7 can be accommodated.
  • the spaced along the circumference and mutually parallel to each other extending rods 7 are held both mechanically by the short-circuiting rings 1 and electrically connected to each other.
  • the short-circuit rings 1 are initially not made in one piece, but are composed of a plurality of part-circular segments 1 1 together. Such a part-circular segment 1 1 is shown enlarged in Fig. 2. Each of the segments 1 1 has at its to the interior of the rotor and / or on its outer side of the rotor 3 side facing a Operazylinderbogen-shaped surface, so that a plurality of circumferentially adjacent juxtaposed arcuate segments 1 1 a total of a short-circuit ring with a circular or form cylindrical geometry.
  • the segments 1 1 On the outwardly directed side, the segments 1 1 have one or more groove-like recesses 13 which are complementary in cross-section to the to be received on the rods 7 are formed.
  • the segments 1 1 On the outwardly directed side, the segments 1 1 have one or more groove-like recesses 13 which are complementary in cross-section to the to be received on the rods 7 are formed.
  • the individual partial arc-shaped segments 1 1 may have a different size and a
  • a single segment 1 1 only a single
  • Recess 13 have or more, for example, up to twenty, recesses 13 and thereby extend over an angular range of, for example, only a few degrees or up to, for example, 30 °.
  • the segment 1 1 may have a projecting portion, which may serve as a spring 15, whereas a recess may be arranged on an opposite side surface, which may serve as a groove 17, so that adjacent
  • Segments 1 1 can be connected to each other by a tongue and groove connection.
  • All segments 1 1 may preferably be formed identically, so that they can be easily manufactured, transported and stored. Theoretically, the segments can be stored and transported as bulk material.
  • An area of a yoke, that is below the grooves, can with a
  • a positive and negative contour can be imaged, which can facilitate the joining of the segments to a blank.
  • the segments 1 1 can in this case be used for both sides of the short-circuit cage.
  • the segments 1 1 can be produced for example by extrusion.
  • the segments are extruded in a die and then cut to length of the short-circuit ring 1 to be manufactured from the strand. Extruding the segments can be compared to one
  • Casting method have the advantage that no Endformschrägen and thus a directed assembly is necessary. Another advantage is a possible work hardening in extruded profiles and thereby Increased strength, which can be used, for example, to increase a speed resistance
  • a contour of a segment 1 1 can be designed so that per segment one or more rods 7, depending on the diameter of the rotor 3, covered and an area of the yoke under the grooves is provided with a coding.
  • the segments 1 for example, preferably cohesively connected to the lateral surface and / or end face with the rods 7.
  • Adjacent segments 1 1 are also connected to adjacent surfaces preferably cohesively. Any existing gap between adjacent segments can be closed.
  • the joining of adjacent segments 1 1 or the joining of a segment 1 1 with rods 7 introduced in its recesses 13 can take place, for example, by means of a welding process.
  • a lateral surface and / or an end face of a segment 11 can be welded together with the bars 7 as well as adjoining side surfaces of adjacent segments 11.
  • a laser welding method can be used by means of which even complex geometries can be welded together.
  • the components can also be soldered together, wherein either the components can be soldered individually and partially or a large part or preferably all of them
  • FIGs. 3 and 4 is an alternative embodiment of an inventive
  • the partial arc-shaped segments 1 1 are not as massive components with a material thickness of
  • Fig. 2 provided, for example, several millimeters, as shown in Fig. 2 and how they can be produced in the extrusion process.
  • the segments 1 1 are provided in the form of thin sheets 19.
  • Each individual sheet can have a relatively low material thickness of, for example, less than 5 mm, preferably less than 3 mm.
  • the sheets 19 may be punched into a suitable shape, in particular fine-punched.
  • a thickness measured in the axial direction of the rotor 3, which allows sufficient mechanical strength and sufficient electrical conductivity
  • more of these thin sheets 19 can be stacked one behind the other.
  • the thin sheets 19 arranged in several layers can be arranged offset from one another in the circumferential direction.
  • the sheets 19 of the adjacent segments 1 1 can be materially interconnected.
  • a soldering of the individual appears
  • Sheets 19 easier to handle than a welding, especially when a Tauchlötbad is used. This would also have the advantage that as well

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Induction Machinery (AREA)

Abstract

L'invention concerne un anneau de court-circuit (1) pour un rotor (3) d'une machine électrique asynchrone. L'anneau de court-circuit (1) est circulaire et présente, le long de son pourtour, une pluralité d'encoches (13) s'étendant dans la direction axiale et dans lesquelles des barres (7) d'une cage de rotor de la machine asynchrone peuvent être introduites. L'anneau de court-circuit est composé de plusieurs segments (11) en portions d'arc de cercle.
EP14723806.7A 2013-06-13 2014-05-14 Anneau de court-circuit pour machine électrique asynchrone composé de segments en portions d'arc de cercle Active EP3008799B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201310211040 DE102013211040A1 (de) 2013-06-13 2013-06-13 Kurzschlussring für eine elektrische Asynchronmaschine zusammengesetzt aus Teilkreisbogen-förmigen Segmenten
PCT/EP2014/059823 WO2014198477A2 (fr) 2013-06-13 2014-05-14 Anneau de court-circuit pour machine électrique asynchrone composé de segments en portions d'arc de cercle

Publications (2)

Publication Number Publication Date
EP3008799A2 true EP3008799A2 (fr) 2016-04-20
EP3008799B1 EP3008799B1 (fr) 2019-02-27

Family

ID=50721793

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14723806.7A Active EP3008799B1 (fr) 2013-06-13 2014-05-14 Anneau de court-circuit pour machine électrique asynchrone composé de segments en portions d'arc de cercle

Country Status (4)

Country Link
US (1) US10381906B2 (fr)
EP (1) EP3008799B1 (fr)
DE (1) DE102013211040A1 (fr)
WO (1) WO2014198477A2 (fr)

Families Citing this family (9)

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Publication number Priority date Publication date Assignee Title
KR102080633B1 (ko) * 2013-10-15 2020-02-24 현대모비스 주식회사 유도 모터용 엔드링 및 이를 적용한 회전자
DE102015223058A1 (de) * 2015-11-23 2017-05-24 Bayerische Motoren Werke Aktiengesellschaft Käfigläufer und Verfahren für dessen Herstellung
FR3057411B1 (fr) 2016-10-06 2020-07-17 Ge Energy Power Conversion Technology Limited Rotor segmente pour machine asynchrone et machine asynchrone comportant un tel rotor segmente
EP3402057A1 (fr) * 2017-05-09 2018-11-14 Siemens Aktiengesellschaft Procédé de fabrication d'un rotor à cage d'écureuil d'une machine asynchrone
EP3425778A1 (fr) * 2017-07-04 2019-01-09 Siemens Aktiengesellschaft Procédé de fabrication d'une bague de déphasage fabriquée à partir d'une bande métallique
EP3425779A1 (fr) * 2017-07-05 2019-01-09 Siemens Aktiengesellschaft Induit à cage d'écureuil d'une machine asynchrone
WO2019036461A1 (fr) 2017-08-15 2019-02-21 Quanten Technologies, Inc. Barres de connexion destinées à un système de moteur
EP3595146A1 (fr) * 2018-07-12 2020-01-15 Siemens Aktiengesellschaft Rotor à cage en court-circuit, procédé de fabrication
WO2021032379A1 (fr) * 2019-08-16 2021-02-25 Siemens Aktiengesellschaft Procédé de fabrication d'un rotor à cage d'écureuil d'une machine asynchrone

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Also Published As

Publication number Publication date
EP3008799B1 (fr) 2019-02-27
US10381906B2 (en) 2019-08-13
DE102013211040A1 (de) 2014-12-18
US20160141944A1 (en) 2016-05-19
WO2014198477A2 (fr) 2014-12-18
WO2014198477A3 (fr) 2015-07-02

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